Collection of D...

Under _______ of enquiry, the trained enumerators personally visits the informants and explain the objectives of enquiry, ask questions and record their replies.

Sampling process involves __________________.

Under which of the following method, investigators collect data by contacting third-party or informants who are supposed to possess the information on the problem under investigation?

In case of rail accident, the appropriate method of data collection is by a ________.

Under which of the following method, investigators personally visit the respondents, ask them questions pertaining to the enquiry and collect the desired information?

Statistical data are collected only with ____________.

_______ refers to the process of learning about population on the basis of sample drawn from it.

_______ method of collecting information is usually adopted by newspaper agencies.

The source note is required if  _______ is used.

The accuracy of Sampling is based on two laws_______________.